@ARTICLE{ iet:/content/journals/10.1049/joe.2018.8722, author = {Qiang Huang}, author = {Guibin Zou}, author = {Chunhua Xu}, author = {Jie Zhang}, author = {Shuo Zhang}, keywords = {EMTDC;internal faults;short-circuit fault characteristics;dc transmission line protection method;TP;fault voltage;PSCAD;external faults;single-end protection scheme;current-limiting reactors;four-terminal symmetrical bipolar HVDC grid;abrupt changing point;multilevel converter-based HVDC grid;transition period;transient voltages;MMC;fast single-end line protection method;meshed multiterminal HVDC grid;protection technique;}, language = {English}, abstract = {In view of the short-circuit fault characteristics, the protection technique of the dc lines limits the development of the modular multi-level converter (MMC)-based HVDC grid in a large extent. This study derives the calculation formulas of the transient voltages of internal and external faults and proposes a single-end protection scheme based on the transition period (TP) from the abrupt changing point to the first extreme point of the fault voltage. Due to the current-limiting reactors, the TP of the internal fault is much shorter than that of the external fault, which is used to discriminate internal fault from external fault. A four-terminal symmetrical bipolar HVDC grid based on MMC is modelled using PSCAD/EMTDC, and simulation results demonstrate the validity of the new proposed dc transmission line protection method.}, title = {Fast single-end line protection method for the meshed multi-terminal HVDC grid}, journal = {The Journal of Engineering}, issue = {16}, volume = {2019}, year = {2019}, month = {March}, pages = {1602-1606(4)}, publisher ={Institution of Engineering and Technology}, copyright = {This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)}, url = {https://digital-library.theiet.org/;jsessionid=129rwcwh2x7e5.x-iet-live-01content/journals/10.1049/joe.2018.8722} }